Hybrid capacitor

Abstract

Disclosed herein is a hybrid capacitor including: a first structure including a cathode containing activated carbon and an anode containing lithium; and a second structure including activated carbon layers formed on both surfaces of a current collector. With the hybrid capacitor, characteristics of an LIC and characteristics of an EDLC are implemented in a single cell, thereby making it possible to increase energy density and improve output characteristics.

What is claimed is: 
     
       1. A hybrid capacitor comprising:
 a first electrode including lithium layers formed on both surfaces of a current collector; 
 a second electrode including activated carbon layers formed on both surfaces of an aluminum foil; and 
 a third electrode including activated carbon layers formed on both surfaces of a current collector, 
 wherein the electrodes are disposed in the order of the third electrode, the first electrode, the second electrode, and the third electrode. 
 
     
     
       2. The hybrid capacitor according to  claim 1 , wherein at least two combinations of the first and second electrodes are disposed between the two third electrodes disposed at an outermost portion of the hybrid capacitor. 
     
     
       3. The hybrid capacitor according to  claim 1 , wherein the electrodes include separators provided thereamong. 
     
     
       4. The hybrid capacitor according to  claim 1 , wherein the first electrode includes lithium metal layers formed on both surfaces of a current collector. 
     
     
       5. The hybrid capacitor according to  claim 4 , wherein the current collector is a copper foil. 
     
     
       6. The hybrid capacitor according to  claim 4 , wherein the lithium metal layers further include lithium nitride (Li 3 N) layers formed on outer surfaces thereof. 
     
     
       7. The hybrid capacitor according to  claim 1 , wherein the second electrode is formed by attaching a conductive material, activated carbon, and a binder to both surfaces of an aluminum foil. 
     
     
       8. The hybrid capacitor according to  claim 1 , wherein the third electrode is formed by attaching a material containing 5 to 10 wt % of conductive material, 80˜90 wt % of activated carbon, and 5˜10 wt % of binder to both surfaces of the current collector. 
     
     
       9. The hybrid capacitor according to  claim 1 , wherein the electrolyte solution is a mixture of a lithium salt and a non-lithium salt. 
     
     
       10. The hybrid capacitor according to  claim 9 , wherein the lithium salt is at least one selected from a group consisting of LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiN(C 2 F 5 SO 2 ) 2 , LiN(CF 3 SO 2 ) 2 , and CF 3 SO 3 Li, LiC(CF 3 SO 2 ) 3 . 
     
     
       11. The hybrid capacitor according to  claim 9 , wherein the non-lithium salt is at least one selected from a group consisting of TEABF 4 , TEMABF 4 , SBPBF 4 , EMIBF 4 , DEMEBF 4 .